Learn how to use React Native's InteractionManager to schedule expensive tasks after animations, keeping UI fluid and responsive.

defer-heavy-work-interactionmanager.md

Insight

In React Native, UI thread contention is a common cause of janky animations, especially when you start expensive calculations or network calls immediately after a navigation event. InteractionManager lets you schedule work to run only after all ongoing interactions—animations, gestures, transitions—have completed, freeing the UI thread for a smooth frame rate.

Example

import { InteractionManager } from 'react-native';
import { useEffect } from 'react';

export function Screen() {
  useEffect(() => {
    const task = InteractionManager.runAfterInteractions(() => {
      // Heavy parsing or state updates that can wait
      const parsed = JSON.parse(largePayload);
      setData(parsed);
    });
    return () => task.cancel();
  }, []);

  return <MyComponent data={data} />;
}

Takeaway

Wrap any non‑essential, heavyweight work in InteractionManager.runAfterInteractions. By deferring it until after UI interactions, you keep the main thread light and your animations buttery‑smooth.